Can you worry about the installation of the graphics card instead of the power supply? Well, GTX670 itself is relatively long, and most manufacturers have lengthened the radiator. I'm afraid your chassis is broken. At the opposite end of the graphics card, the hard disk shelf is continuous, not a gap, so you have to be mentally prepared to change the chassis.
Size is secondary, and performance matching is more important. Compared with the performance of GTX670, i5 is dwarfed, i7 is just right, but it matches the Ivy of GTX680? Bridge-E, Intel hasn't released it yet